/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License. You may obtain a
* copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
/**
*
*/
package org.apache.geode.cache.query.internal;
import java.io.Serializable;
/**
* This interface defines a Hashing strategy for keys(OR values) in a HashMap(OR HashSet) for
* calculation of hash-code for custom objects and primitive types.
*
* @since GemFire 8.0
*
*/
public interface HashingStrategy extends Serializable {
/**
* Computes a hash code for the specified object. Implementors can use the object's own
* <tt>hashCode</tt> method, the Java runtime's <tt>identityHashCode</tt>, or a custom scheme.
*
* @param o object for which the hash-code is to be computed
* @return the hashCode
*/
public int hashCode(Object o);
/**
* Compares o1 and o2 for equality. Strategy implementors may use the objects' own equals()
* methods, compare object references, or implement some custom scheme.
*
* @param o1 an <code>Object</code> value
* @param o2 an <code>Object</code> value
* @return true if the objects are equal according to this strategy.
*/
public boolean equals(Object o1, Object o2);
}